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Bijou All Tube Futterman Headphone Amplifier - Page 8

post #106 of 3977
2/12/08 at 7:10am
Tube sockets soldered on. Just wanted to see those tubes mounted......he he ;-) Wondering how it sounds with K701? Low impedance. Anyone know?
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post #107 of 3977
2/12/08 at 2:00pm
Quote:
Originally Posted by n_maher View Post
I would take the "0.065a total" to mean that you can use both of the high voltage secondaries (90 and 235, since they have the * marker) provided the total current draw limit of .065A is not exceeded.
Geez I love this place. Where on earth could I ever have learned that! Coolio!
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post #108 of 3977
2/13/08 at 6:00am
Step two, deciding on the layout, for my stainless substrate. ;-)

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post #109 of 3977
2/13/08 at 1:59pm
Quote:
Originally Posted by amphead View Post
Step two, deciding on the layout, for my stainless substrate. ;-)
Wow, you're really crankin along there, amphead. I think I resolved my my previous issues (and apologize if my post looked cranky) and the parts are on their way.
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post #110 of 3977
2/13/08 at 8:36pm
What fuse size would be appropriate for this amp? Slo blo or quick acting?

Almost finished and almost ready to start testing.
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post #111 of 3977
2/14/08 at 10:27am
Quote:
Step two, deciding on the layout, for my stainless substrate. ;-)
I'm not so sure about mounting those tube sockets first. It's going to be hard to solder the small stuff, like the resistors and diodes.
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post #112 of 3977
2/15/08 at 8:15am
Quote:
I'm not so sure about mounting those tube sockets first. It's going to be hard to solder the small stuff, like the resistors and diodes.
True, but in many ways this build is going to be reasonably easy. I am working on some aesthetic aspects of my chassis design. Just purchased some Cocobolo to dress up the sides of the case. I wanted to look at the height of the tubes to get ideas for keeping fingers out of the HV regions, while still allowing those beautiful boards to show. ;-)
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post #113 of 3977
2/15/08 at 9:47am
Mine, for now is going on an old fashion looking Hammond chassis with the big cage. Powered it up last nite and have 5 glowing tubes. Planning on finishing up the rest of the wiring over the weekend and plugging in. Hopefully post some pics after.
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post #114 of 3977
2/16/08 at 7:28am
Great news, looking forward to seeing your pics and evaluation.
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post #115 of 3977
2/17/08 at 8:51am
Ordered 80% of my parts. On the hunt for the large electrolytics and film caps. Should be stuffing my boards by midweek. ;-) Some more chassis work tomorrow.
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post #116 of 3977
2/17/08 at 2:38pm
Quote:
Ordered 80% of my parts. On the hunt for the large electrolytics and film caps. Should be stuffing my boards by midweek. ;-) Some more chassis work tomorrow.
Try one of these photo flash capacitors for output (C5) cap. Their fast discharge characteristics are better for output coupling.
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post #117 of 3977
2/17/08 at 2:53pm
Finished casing this up this morning. Just plugged it in 15 minutes ago and powered it up.

WOW.

Very nice bass, not flabby but plenty deep and popping. Great silence between notes on the current jazz selection. Nice high end sparkle. Big soundstage. Can't wait to burn it in and see what this is trully capable of.

Here are some pics. My casing leaves a little to be desired, but hope to change to a nice wooden case soon and spruce it up a little.





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post #118 of 3977
2/17/08 at 7:02pm
Nice job rhester! I should have mine fired up late tonight.
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post #119 of 3977
2/18/08 at 5:12am
Awesome work Rhester!
And thanks for the advice Mazuki! Maybe ;-)

Heres the bare chassis that I built w/oak.



Heres the amp substrate laying on top unmounted. Cocobolo faces will be glued to the oak. Solid 24kt gold volume knob optional ;-)

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post #120 of 3977
2/18/08 at 6:05am
Well Mazuki, now you've gone and done it. I purchased the Rubycon photo flash 410uF 300sv ouput caps. Its true, that since we have to block the DC in this design, that output caps are a neccessity. I might as well have the step up there. Hope the bass extends deep enough with 410uF vs 470uF. ;-)
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